Minutes of Jan 15 cal working group

[Elton Smith <elton@jlab.org>]

=Minutes=
Attending: JLab: Beni, Elton, Fernando; UofR: Zisis, Blake, George,
Andrei; IU: Claire, Ryan, Matt, Brad

# Announcements: It is cold in Regina (-40). Our next phone conference
will be Thu Feb 12.
# FCAL Update
## Redesign of magnetic shield for Fcal to accomodate concentric
cylindrical shields.
## Hardware status at collaboration meeting
## [http://www.ph.ed.ac.uk/~claire/Tarbert_FCALCalibration.pdf FCAL
Calibration with pi0s] presented by Claire.
##* Became a software project
##* Goals: calibrate detector using pi0 and etas as a source of high
energy photons.
##* Not yet determined accuracy possible for calibration, but considerable
effort has gone into putting the necessary tools in place.
# BCAL Update
## Fibers
##* Kuraray will ship first article fibers at the end of the month. 50
fibers to Regina, 50 to JLab and keep 50 at Kuraray. Length will be 410
+4/-0 with label on the last 2 cm.
##* Beni is setting up automatic procedures for testing fibers. Present
90Sr source rate is limited and will require about 1 day for a complete
test of one fiber.
##* UofR: Attenuation length measurements using the UV spectrometer can be
done very fast. Tests with a 90Sr source is more time consuming, and uses
the same DAQ system as the tests for the SiPM.
##* Handling proceedures during construction will be written up by UofR
for comments by Kuraray
## Construction
##* UofR is obtaining more information from Ross machining about their
cutting and polishing capabilities, as well as hourly rates
##* Will run some short lengths of Pb through the swager. Examine samples
of Pb under the microscope to optimze swager settings, before shipping
swager to Alberta.
## Shower reconstruction
##* Blake has new results but they were not yet ready for presentation.
Should have something to show at the collaboration meeting
##* Andrei is investigating charged particle energy depositions in
calorimeter as a way to calibrate the detector.
## B-field at pmts
##* Elton has updated
[http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=912
GlueX-doc-912 Magnetic fields at pmt locations] using the new ANSYS
magnetic fields.
##* The angle of the field relative to the z-axis is quite large and it
will be a challenge to find good operating point for the fine mesh pmts.
# [[GlueX-Collaboration-Jan-2009 | GlueX collaboration meeting]]
#* Fcal hardware (Matt)
#* Bcal updates (Zisis or George)
#* SiPM update (Carl)
#* Bcal construction (Elton)
#* Calibration using pi0 photons (Claire) in offline session
# Any other business


Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave
Suite # 16
Newport News, VA 23606
elton@jlab.org
(757) 269-7625
(757) 269-6331 fax